Automatic cut-off for gas.



No. 784,915. v PATENTED MAR. 14, 1905.

J. B. BROWN.

AUTUMATIG GUT-OFF FOR GAS. A PPLIoATIoN FILED JAN. 9, 1904.

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UNITED STATES atented March 14, 1905.

JOHN BABTIST BROWN, 4OF AKRON, OHIO.

AUTOMATIC CUT-OFF FOR GAS.

SPECIFICATION forming part of Letters Patent No. 784,915, dated March 14, 1905.

Application filed January 9, 1904. Serial No. 188,371.

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Be it known that l, JOHN BABTIs'r BROWN, a citizen of the United States, residing at Akron, in the county of Summit and State of Ohio, have invented new and useful Improvements in Automatic Out-Offs for Gras, of which the following' is a specification.

My invention relates to means for automatically cutting olf the supply of gas in servicepipes when the pressure falls below a predetermined point, thereby avoiding a continued flow of gas after lights have been extinguished by reason of such fall in pressure, which fall may have been but temporary, permitting the normal amount to escape from the burners at4 which the lights had been extinguished unless the gas was cut off as soon as the pressure fell.

My invention consists of the novel features of construction and combination of parts hereinafter described, particularly pointed out in the claims, and shown in the accompanying drawings, in which-- Figure 1 is a perspective view of my device. Fig. 2is a vertical section through the casing, the connecting-pipes being' shown in section and the interior mechanism being shown in elevation. Fig. 3 is a horizontal section, a portion of the casing being broken away, on the line 3 3 of Fig. 2.

VIn the drawings, A represents a casing, preferably cylindrical in form, A a section of a service-pipe discharging into the casing A, and Aza pipe-section leading from the casing, the casing being interposed between the sections of the service-pipe at any desired point. The casing A is divided horizontally into two portions, the lower portion forming the body of the casing and the upper portion a top or cover, both portions being flanged, as shown at A3, the flanges resting adjacent each other and being secured together by suitable screws. Between the flanges is held a disk B of any desired material, thin copper being preferred, which forms a horizontal partition in the casing. Secured to the bottom of the casing is a base-plate C, carrying at its ends vertically-arranged brackets C and C2,formingguide-brackets through which work a plunger-rod O3. An adjustable block Oi is carried by the plunger-rod between the brackets, and a coiledsln'ing C, which encircles the plunger-rod O3, bears at one end against the block Ol and at its opposite end against the bracket O2. The block O" is held against longitudinal movement along the plungerrod by means of a suitable set-screw, and the block can be adjusted to regulate the pressure exerted by the spring O5. At the forward end of the plunger-l'od is arranged a valve D, the frontface of which is covered with buckskin,as shown at D'. Flanged openings A4 are formed diametrically opposite each other in the sides of the casing, the sections of the service-pipe fitting' in the iianges A", and the plunger-rod C3 works in alinement with these openings, one of which is adapted to be closed by the valve D cutting off the suply of gas to the pipe-section A, which supplies the burners. At its rear end the plunger-rod C is enlarged and bifurcated, and in the bifurcated portion is arranged a roller C, and adjacent the roller the plunger-rod carries a depending' lug O7.

A lever E is pivoted intermediate its ends to the upper portion of the bracket O2, and adjacent the rear end of the lever a curved recess is formed, as shown at E'. A rod F is secured at its upper end to the under face of the disk B, and preferably at the center of the disk and at its lower end the rod is pivoted to the forward end of the lever E.

Mounted on the top of the casing and ccntrally arranged is a cylindrical cap Gr, over which is threaded a cover or top piece Centrally arranged upon and secured to the upper face of the disk B is a rod H, formed in two sections connected by links H, forming' a universal joint, and the upper section of the rod H extends upward through the top of the casing A into the cap G. The upper end of the rod is threaded, and a nut H2 is arranged on this threaded portion, while a coiled spring is arranged on the rod between the nut and the top of the casing A, the spring bearing at one end on the nut and at the opposite end on the top of the casing.

Extending through a boss J, formed in one side of the casing, is a rotatable shaftJQ joui'- naled at its inner end in a portion of the bracket C2 and arranged at a right angle to ICO the plunger-rod C3. At its inner end the shaft J'r carries a crank J 2, having a pin J3, which engages the lug C7 on the plunger-rod C3.

The operation of the cut-oil'l is as follows: A suitable hand-wheel J" is arranged on the outer end of the shaft J, and by rotating same the rotation ol the shaft rotates the crank, and the pin pressing on the lug draws baek the plunger-rod C, drawing back the valve D and opening' the entrance to the pipesection A. The flow ot' gas being normal, it is obvious that there will be an equal pressure on each side ot' the valve and also an upward pressure on the disk B. rlhe rearward movement of the plunger-rod just described causes the roller, which had been resting in the recess E', to move out of said recess and lift the rear end of the lever E, while at the same time the pressure upward of the gas on the disk B and the upward pressure of the spring H3 on the nut H2 also tends to draw upward the disk B. The said disk being elastic or springy, this upward movement of the central portion olE the disk tends to lift the forward end of the lever E and depress the rear end, the result being that the rear end bears with considerable pressure on the roller C, eounterbalancing the forward tendency given the plunger-rod C by the spring C and holding it locked. Should, however, the pressure of the gas be reduced suiliciently, the spring C will overcome the locking eifect due to the combination of the pressures of the gas and spring H, and the plunger will move forward and the valve will close the opening A1. In this position the roller C will again be in engagement with the recess E', and when the pressure ot' the gas is restored to its normal degree the valve will still remain closed, as there will be now an excess of pressure against the rear face ol the valve, so that the pressure of the gas will now cooperate with the spring' C" to hold the valve closed. The valve will remain closed until the device is again set by rotation of the hand-wheel J4.

Having thus fully described my invention, what I claim as new, and desire to secure by Letters Patent, is-

1. In a device of the kind described, a casing, a supply-pipe, a service-pipe leading from the casing, a spring-pressed valve adapted to close the inner end of the service-pipe, an elastic diaphragm, a lever operable by movement of the diaphragm and adapted to lock the valve in open or closed position, and a spring adapted to cooperate with pressure of the gas in lifting the diaphragm.

2. ln a device of the'kind described, a casing, supply and service pipes, a movable plunger, a valve carried thereby and adapted to close one of the pipes, an adjustable spring adapted to close the valve, a lever adapted to lock the plunger against movement, a diaphragm connected to said lever and adapted to be moved by pressure of the gas and to lift the lever, and a spring connected to the diaphragm and adapted to counterbalance the lirst-mentioned sprino'.

3. A device of the kind described comprising a casing, service and supply pipes, a plunger longitudinally movable, a valve carried by the plunger adapted to close the service-pipe, a spring adapted to force the plunger forward, a roller carried by the plunger, an elastic diaphragm arranged parallel with the plunger, a lever pivoted intermediate its end and adapted to be actuated by the diaphragm, one end of said lever resting on the roller, and being recessed adjacent said end, the roller engaging the said recess when the valve is closed, and a spring adapted to cooperate with gas-pressure in lifting the diaphragm.

JOHN BABTIST BROVN. lVitnesses:

GrUs'rAv Trunsn, R. F. PALMER. 

